Bismuth borates:: Two new polymorphs of BiB3O6

被引：58

作者：

Li, LY ^{[1
]}

Li, GB ^{[1
]}

Wang, YX ^{[1
]}

Liao, FH ^{[1
]}

Lin, JH ^{[1
]}

机构：

[1] Peking Univ, Coll Chem & Mol Engn, State Key Lab Rare Earth Mat Chem & Applicat, Beijing 100871, Peoples R China

来源：

INORGANIC CHEMISTRY | 2005年 / 44卷 / 23期

关键词：

D O I：

10.1021/ic050190k

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Two new polymorphs of BiB3O6 were identified at low temperatures using boric acid as a flux. Unlike alpha-BiB3O6, which crystallizes in a noncentrosymmetric space group and, thus, shows exceptional nonlinear optical (NLO) properties, beta-BiB3O6 (I) and gamma-BiB3O6 (II) crystallize in the centrosymmetric space group P2(1)/n with the following lattice parameters: a = 14.1664(I), b = 6.7514(I), c = 4.4290(I) angstrom, beta = 102.125(I)degrees for I; and a = 8.4992(I), b = 11.7093(I), c = 4.2596(I) angstrom, beta = 121.141(I)degrees for II. However, from the structural point of view, the three polymorphs of BiB3O6 are closely related. The structure of beta-BiB3O6 (I) contains a 2-dimensional borate layer, which could be considered to be an intralayered additive product of alpha-BiB3O6. On the other hand, the 3-dimensional borate framework in gamma-BiB3O6 (II) could be considered to be an interlayered additive product of beta-BiB3O6 (I). According to the synthesis experiments and calculated density, it is proposed that compounds I and II should be the low-temperature (high-pressure) polymorphs of BiB3O6.

引用

页码：8243 / 8248

页数：6

共 30 条

[21] Structural aspects in crystal growth of anhydrous borates [J].